What is your hypothesis for the ice experiment?
Hypothesis:The hypothesis for this experiment is that the ice cube containing the ½ tsp. of saltwill have a fasting melting speed than the ice cube melting with zero additives. of granulated salt had a fastermelting time than the cube with zero additives.
How does salt affect the melting point of ice experiment?
The salt lowers the freezing point of water through a process called freezing point depression. The ice starts to melt, making liquid water. Salt dissolves in the water, adding ions that increase the temperature at which the water could re-freeze. It makes the ice cream cold enough to freeze.
Is Melting ice with salt a chemical or physical change?
As an ice cube melts, its shape changes as it acquires the ability to flow. However, its composition does not change. Melting is an example of a physical change.
What is the chemical reaction between ice and salt?
When added to ice, salt first dissolves in the film of liquid water that is always present on the surface, thereby lowering its freezing point below the ices temperature. Ice in contact with salty water therefore melts, creating more liquid water, which dissolves more salt, thereby causing more ice to melt, and so on.
Is Melting plastic a chemical reaction?
Melting plastic is not a chemical reaction, but rather is a physical change. When a substance changes its phase, such as solid melting to liquid, it…
Is Melting plastic reversible?
When ice is heated, it melts and becomes liquid water. Further cooling will cause the liquid water to freeze into ice. Plastic is a material that can be made into almost any shape by heating it at a high temperature. Plastic goes through a reversible change when it is recycled.
What is the chemical process to make plastic?
Two main processes are used to produce plastics – polymerisation and polycondensation – and they both require specific catalysts. In a polymerisation reactor, monomers such as ethylene and propylene are linked together to form long polymer chains.
Can we make plastic without oil?
Scientists have discovered a previously unknown way that some bacteria produce the chemical ethylene – a finding that could lead to new ways to produce plastics without using fossil fuels. The study, published today (Aug. Currently, oil or natural gas are used to create ethylene.
What is the main ingredient in plastic?
The main ingredient in most plastic material is a derivative from crude oil and natural gas. There are many different types of plastics – clear, cloudy, solid colour, flexible, rigid, soft, etc. Plastic products are often a polymer resin which is then then mixed with a blend of additives (See polymer vs. plastic).
How do you make oil from plastic?
In pyrolysis, plastic waste is heated in the absence of oxygen, which produces mixture of oil similar to crude oil. This can be further refined into transportation fuels. Gasification and pyrolysis are completely different processes to simply incinerating the plastic.
What percentage of oil is used for plastics?
About 8% to 10% of our total oil supply goes to making plastic. It is estimated that about 12 million barrels of oil a year are used in making the plastic bags used in the US. An average American throws away about 10 bags a week.
Is it environmentally friendly to produce oil from waste plastic?
In this context, recycling of waste plastic as a fuel through pyrolysis in an inert atmosphere is an environmentally friendly solution. It has been concluded that waste plastic oil has similar properties to diesel fuel and can be used instead of diesel [7, 8].
How do you make plastic from petrol waste?
The present work involves the synthesis of a petroleum-based fuel by the catalytic pyrolysis of waste plastics. Catalytic pyrolysis involves the degradation of the polymeric materials by heating them in the absence of oxygen and in the presence of a catalyst.
Does petrol react with plastic?
Certain plastics dissolve in gasoline because they have similar chemical structures. The hydrocarbons in gasoline interact freely with those in the plastic. If the interaction between gasoline and the plastic is less energetic than that of the bonds in the plastic, the plastic will dissolve.
Can you make your own petrol?
It takes some mechanical aptitude, but you can make your own fuel by fermenting appropriate feed stocks into 96 proof alcohol. For small producers, the best choices as ethanol feedstocks are crops with a lot of starch or sugar, such as corn (shown above) or sugar beets.
Can plastic be burned cleanly?
Plastic is made from oil and gas, and it creates a lot of heat when it’s burned. It’s even more efficient if the incinerator can capture the waste heat from the process and use it to warm offices and homes. Burning plastic this way currently substitutes in some places for burning dirty fossil fuels like oil or coal.
Why can’t we just burn all the plastic?
So all the plastic that isn’t collected for burning will eventually find its way to the oceans, lakes and parks. On top of that, incineration contributes to more pollution, through air emissions. Plastics in particular, when burned, release pollutants such as dioxins and heavy metals.
Why is burying garbage bad?
Burying garbage also causes both air and water pollution, and simply transporting it to the sites consumes an increasing amount of valuable fossil fuels, which produces more pollution and other problems. Buried in a landfill, the typical plastic trash bag takes 1,000 years to degrade, giving off toxins as it does.
Is it better to burn or bury plastic?
But studies have shown that recycling plastic waste saves more energy—by reducing the need to extract fossil fuel and process it into new plastic—than burning it, along with other household waste, can generate.
Is it better to burn or bury a body?
Burial is considered safe as the body is sealed. “The body takes 7-10 days to decompose, and the body fluids can take 3-4 days to dry up. If the body is cremated, the ash does not pose any risk either.
Is it eco friendly to burn cardboard?
Burning cardboard is not an eco-friendly option because it can release harmful chemicals into the air, particularly if you are burning colored cardboard that contains more chemicals. Instead, you should recycle or compost your cardboard.
Is cardboard OK to burn?
Cardboard. While it’s easy to ignite and may seem like a good way to help get a fire started, burning cardboard can be dangerous. Because cardboard is treated with chemicals and often contains inks, it can release them into the air when burned. You don’t want to breathe those in!
Can you burn wood in your backyard?
Enjoy Your Fire Pit Responsibly If you choose to burn wood, reduce particle pollution with these steps: Only burn seasoned, dry wood, which burns hotter and cleaner. Never burn green wood, construction waste, plastic, garbage, or yard waste. They create more smoke and can be toxic.
Can you have an open fire in your backyard?
Backyard burning and unauthorised incineration are prohibited at all times in all council areas in the Sydney, Wollongong and Newcastle regions, and in other NSW council areas listed in Schedule 8 of the Clean Air Regulation. Part 3 of the Clean Air Regulation sets out the details of permitted and prohibited fires.
Can I put a fire pit in my backyard?
Yes. Backyard fire pits are legal as long as they follow the laws and regulations set up by the county they are in. You can even take portable fire pits to campsites or be permitted to build them there. As long as you learn the basic rules to have a backyard fire pit you will be fine.
Is a fire pit considered an open fire?
In most cases, yes it does. That being said, many municipalities define open burning to not include burning in a fire pit that is off the ground or covered, as they are less likely to come in contact with other flammable materials by accident, and are less prone to wind-blown sparks and spreading.